str1='hello world'

str2="hello world"

str3='''hello
world  
'''

print(str1)

print(str2)

print(str3)

print('hel\'lo world')#\转义符

print('123---{0}---{1}'.format(4,5))

print(f'123---{str1}')

for i in range(0,101,2):
    print("======开始======")
    if i ==100:
        print("成功")
    else:

        # print(f'{i}%','[',"*"*(i//2),"."*((100-i)//2),']')

        #上下二者皆可

        str4="*"*(i//2)+"."*((100-i)//2)
        print(f'{i}%[{str4}]')
